2019独角兽企业重金招聘Python工程师标准>>> 
由于项目中有用到RadioGroup，所以写了个demo，研究了下RadioGroup。
下面是布局文件：
页面代码：
public class MainActivity extends Activity {
RadioGroup radioGroup;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
radioGroup = (RadioGroup) findViewById(R.id.radioGroup);
setRadio();
//RadioGroup中radiobutton切换监听
radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
Log.d("Test", "The checked radio button's id is: " + group.getCheckedRadioButtonId());
RadioButton radioButton = (RadioButton) group.findViewById(group.getCheckedRadioButtonId());
Log.d("Test", "The checked radio button's text is: " + radioButton.getText());
}
});
}
//根据获取的数据，动态添加radiobutton
private void setRadio() {
RadioGroup.LayoutParams params = new RadioGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
for (int i=0; i<10; i++) {
RadioButton radioButton = new RadioButton(this);
radioButton.setId(i);
radioButton.setText("Test" + i);
radioButton.setLayoutParams(params);
//默认选中第一个radiobutton
if (i == 0) {
radioButton.setChecked(true);
}
radioGroup.addView(radioButton);
}
}
}写完后运行项目，会发现由于RadioGroup没有自动换行的功能，所以导致如果选项过多的话会显示不全的情况：
然后顺便网上copy了一份关于RadioGroup自动换行的代码：
public class FlowRadioGroup extends RadioGroup {
public FlowRadioGroup(Context context) {
super(context);
}
public FlowRadioGroup(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int maxWidth = MeasureSpec.getSize(widthMeasureSpec);
int childCount = getChildCount();
int x = 0;
int y = 0;
int row = 0;
for (int index = 0; index < childCount; index++) {
final View child = getChildAt(index);
if (child.getVisibility() != View.GONE) {
child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
// 此处增加onlayout中的换行判断，用于计算所需的高度
int width = child.getMeasuredWidth();
int height = child.getMeasuredHeight();
x += width;
y = row * height + height;
if (x > maxWidth) {
x = width;
row++;
y = row * height + height;
}
}
}
// 设置容器所需的宽度和高度
setMeasuredDimension(maxWidth, y);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int childCount = getChildCount();
int maxWidth = r - l;
int x = 0;
int y = 0;
int row = 0;
for (int i = 0; i < childCount; i++) {
final View child = this.getChildAt(i);
if (child.getVisibility() != View.GONE) {
int width = child.getMeasuredWidth();
int height = child.getMeasuredHeight();
x += width;
y = row * height + height;
if (x > maxWidth) {
x = width;
row++;
y = row * height + height;
}
child.layout(x - width, y - height, x, y);
}
}
}
}将布局文件中的RadioGroup替换成上面的FlowRadioGroup,再运行项目就能自动换行了